Hello, I am a little confused on the options for Fender Rumble cabs. I have a Fender Rumble combo that I really love, and recently picked up a David Eden 800T head. My head can run 440 Watts in each channel at 4ohms, so I can run two cabs at 440W each - or it can do a bi-amp mono mode that runs 880W in 8ohms. My questions: 1) What are the sound and technical differences in sound/quality between the multiple Fender Rumble cabs? I see three at the same price: 4x10 500W w/horn, 2x10 700W, and a 2x10 700W that says the power handling is "350W Continuous, 700W Program". I am not sure what that means. 2) Also, it may be my lack on knowledge, but why is the 2x10 louder than the 4x10? 3) I was planning on running one channel at 440W at 4ohms to a single cab - but is that a bad idea since these cabs are all 8ohms? 4) Lastly, if I get the 700W cab, could I safely use my head in bridged mode at 880W Ohms as long as I don't max out the volume? Edit: I just saw that guitar center as a 4x10 1000W at the same price! Now I'm more confused... Thanks!